Preparation Whisk cream, horseradish, 2 tablespoons oil, 2 tablespoons vinegar, chopped dill and cayenne in small bowl to blend. Season to taste with salt and pepper. Place watercress in large bowl. Add 1/3 cup cream dressing, 2 tablespoons oil and 2 teaspoons vinegar and toss to coat. Season to taste with salt and pepper. Mound watercress in center of each of 6 plates. Top with sliced onion. Fan apple slices atop salad. Top with trout. Spoon dressing over. Garnish with dill sprigs, if desired, and serve.
Preparation Whisk cream, horseradish, 2 tablespoons oil, 2 tablespoons vinegar, chopped dill and cayenne in small bowl to blend. Season to taste with salt and pepper. Place watercress in large bowl. Add 1/3 cup cream dressing, 2 tablespoons oil and 2 teaspoons vinegar and toss to coat. Season to taste with salt and pepper. Mound watercress in center of each of 6 plates. Top with sliced onion. Fan apple slices atop salad. Top with trout. Spoon dressing over. Garnish with dill sprigs, if desired, and serve.